import java.util.Arrays;
import java.util.Scanner;

// HJ15 求int型正整数在内存中存储时1的个数
public class HJ15 {
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int num = sc.nextInt();
        int sum = 0;
        for (int i = 0; i < 31; i++) {
            if ((num & 1) == 1) {
                sum += 1;
            }
            num = num >>> 1;
        }
        System.out.println(sum);
    }
}
